Apparatus for applying bonding material between implosion band and glass for cathoderay tubes



Oct. 1, 1968 D D ET AL 3,403,658

APPARATUS FOR APPLYING BONDING MATERIAL BETWEEN IMPLOSION BAND AND GLASS FOR CATHODE RAY TUBES Filed Dec. 27, 1965 5 Sheets-Sheet 1 u I2 4? FIG. 6 4s U A, l2 r C I I,

I; a M 15 A 54 $7 I 5 '52 43 22, 42 5o INVENTOR. DANIEL. A'. DAMM FIG. 1 BY DARYL E. POWELL Oct. 1, 1968 D- D ET AL 3,403,658

APPARATUS FOR APPLYING BONDING MATERIAL BETWEEN IMPLOSION BAND AND GLASS FOR CATHODE RAY TUBES Filed Dec. 27, 1965 5 Sheets-Sheet 2 FIG. 3

DANIEL. A. DAMN DAEW- EI. POWELL Oct. 1, 1968 DA M ET AL 3,403,658

APPARATUS FOR APPLYING BONDING MATERIAL BETWEEN IMPLOSION BAND AND GLASS FOR CATHODE RAY TUBES Filed Dec. 27, 1965 5 Sheets-Sheet 5 INVENTOR. DANIEL A. DAMN T31 59a, BY DARVL. E. powszu.

United States Patent 3,403,658 APPARATUS FOR APPLYING BONDING MATE- RIAL BETWEEN IMPLOSION BAND AND GLASS FOR CATI-IODE RAY TUBES Daniel A. Damm, Toledo, and Daryl E. Powell, Maumee, Ohio, assignors to Owens-Illinois, Inc., a corporation of Ohio Filed Dec. 27, 1965, Ser. No. 516,506 9 Claims. (Cl. 1186) ABSTRACT OF THE DISCLOSURE The apparatus disclosed herein comprises a table for supporting the cathode ray bulb with the area of juncture of the bulb and the implosion band extending upwardly and means for rotating the table. A dispensing nozzle is supported for relatively free horizontal and vertical swinging movement adjacent and above the face of the bulb when it is on the table so that the tip of the nozzle contacts and follows the area of juncture of the implosion band and bulb. Means are provided for controlling the delivery of resin through the nozzle in a manner such that initially resin is delivered through the nozzle, after a predetermined interval the table is rotated, the delivery of the resin and rotation of the table is continued until the table has made substantially one revolution, the dispensing of the resin from the nozzle is thereafter interrupted and the rotation of the table is finally interrupted.

This invention relates to cathode ray image tube bulbs and particularly to cathode ray image tube bulbs which are used for television reception.

It has heretofore been suggested that a cathode ray image tube made of glass may be made resistant to implosion and explosive effects on breakage by applying an annular band of reinforcing material around the flange portion of the cathode ray tube which extends from the periphery of the face or viewing portion of the tube and subsequently applying a bead of bonding material such as resin in a gap formed between one edge of the band and the cathode ray tube. Such a method and cathode ray tube are disclosed and claimed in the co-pending application of Daryl E. Powell and Burton W. Spear titled Cathode-Ray and Other Vacuumized Tubes Resistant to Fracture and Capable of Controlled Evacuation, Ser. No. 462,879, filed June 10, 1965, and having a common assignee with the present application.

Heretofore the bonding material has been applied to such a banded cathode ray tube manually or by the use of apparatus which requires accurate synchronization of the movement of a dispensing nozzle with respect to the parts. This has usually required the use of accurate cam mechanisms and fixturing. Furthermore, a separate cam mechanism and fixtures for each size of bulb were required or substantial adjustments were needed as diiferent sizes and configurations of cathode ray tubes were treated.

Among the objects of the invention are to provide an apparatus which will apply a layer of bonding material between the annular band and the periphery of the glass cathode ray tube; which is relatively simple, inexpensive and requires no fixturing or accurate positioning of the bulb; requires no auxiliary cams or programming devices; wherein any configuration of bulb can be treated without any substantial change in the apparatus, wherein the size of the head of bonding material can be easily and simply controlled; and wherein the dispensing nozzle is not dragged in the bead at the completion of the cycle.

In the drawings:

FIG. 1 is a fragmentary perspective view of an appa- "ice ratus embodying the invention showing the pneumatic circuit.

FIG. 2 is a part sectional elevational view of the apparatus shown in FIG. 1 showing the diagrammatic electrical circuit.

FIG. 3 is a fragmentary plan view taken along the line 33 in FIG. 2.

FIG. 4 is a plan view showing the parts in one operative position.

FIG. 5 is a plan view showing the parts in another operative position.

FIG. 6 is a fragmentary sectional view through a portion of a cathode ray bulb which is to be treated by the apparatus embodying the invention.

Referring to FIG. 1, the apparatus embodying the invention is adapted to apply a layer or bead of bonding material such as resin between the upstanding edge 10 of a peripheral band 11 that is mounted on the flange 12 of a cathode ray bulb C, which flange extends substantially parallel to the center line of the tube (FIG. 6). The cathode ray tube C in accordance with conventional construction includes a frusto-conical portion 14 and a neck portion 15.

Referring to FIG. 2, the apparatus includes a table 16 having a circular opening 17 that is surrounded by a rubber ring 18. The table 16 serves as a support for the cathode ray bulb C which is mounted on the table with the neck 15 projecting downwardly through the opening as shown in FIG. 1. As will be presently described, the cathode ray bulb C need not be positioned with great accuracy relative to the table 16.

The table 16 is supported by a bracket 19 on a shaft 20 journalled in a frame 21. The table is rotated by a motor 22 through a speed reducer 23 and sprockets 24, 25 over which a roller chain 26 is trained.

A dispensing nozzle 27 is mounted on the lower end of a dispensing cylinder 28 that is filled with the bonding material to be dispensed, which may comprise an epoxy or polyester resin. A piston 29 divides the cylinder into two chambers and separates the lower chamber that contains the resin from the upper part of the cylinder to which air is supplied for dispensing the resin as presently described. The cylinder 28 is mounted for swinging movement about a horizontal axis on the upper end of a yoke 30 formed on a vertical shaft 31 by pins 32 that extend horizontally from the sides of the cylinder 28 and engage upwardly extending slots 33 in the arms of the yoke 30. The shaft 31 is, in turn, mounted for rotation about a vertical axis in vertically spaced brackets 34, 35 which form a part of an upstanding support 36. A collar 37 retained by a set screw 37a determines the vertical position of the shaft 31 and, in turn, of the yoke 30 relative to the table 16. The upright 36 is adjustable radially relative to the table 16 by bolts 38 and nuts 39 that extend through radial slots 40a in the table (FIGS. 1 and 2).

Referring to FIG. 4, it can be seen that if the end of the nozzle 27 is placed within the gap G on the bulb C and the table 16 is rotated, the end or tip of the nozzle 27 will follow the gap G as the table rotates the bulb and the gap G moves radially inwardly and outwardly as shown in broken lines. As shown in FIG. 5 as the bulb C is rotated to bring the nozzle 27 to the area of juncture of the long and short sides of the rectangular cathode ray bulb, the nozzle 27 extends upwardly and overlies the juncture or corner. Thus, the angle which the nozzle makes with the bulb C varies as the nozzle follows the gap G and the body of the nozzle may overlie portions of the cathode ray bulb. If during this movement resin is being dispensed at a uniform rate, a layer or bead of resin will be applied in the gap G.

Referring to FIG. 1, the pneumatic system for the apparatus comprises a line 40 that extends from a source of pneumatic pressure through a pressure regulator valve 42 and past a pressure gauge 43 to a normally closed magnetic valve 44 that is controlled electrically as presently described. When the magnetic valve 44 is opened, air under pressure is permitted to flow through a line 47 to a valve 48 on the end of the dispensing cylinder 28. This actuates valve 48 to open communication between the upper chamber of the cylinder 28 and an air line 49 which is connected to the line 40 through a line 50, pressure regulator 51 and past a pressure gauge 52. Air is thus supplied to the cylinder 28 to dispense the bonding material from the cylinder.

Again referring to FIG. 1, a line 53 extends to a valve 54 that is controlled by a screw cam 55 on the cam plate 46. When the cam 55 actuates the valve 54, air is supplied momentarily to a small cylinder 56 on the dispensing cylinder 28 to project a plunger 57 against a plate 58.

Referring to FIG. 3, when the plunger 57 is projected, the action serves to lift the nozzle 27 and swing the cylinder 28 outwardly into' overlying relationship with a support bracket 59 so that when the cylinder 56 is de-energized, the resin dispensing cylinder 28 will fall downwardly under the action of gravity against the support 59 and the nozzle 27 will be in overlying relation to a drip cup 59a.

Referring to FIG. 2, the schematic electrical circuit for the apparatus comprises a push button 60 that is momentarily depressed at the start of the cycle after the nozzle 27 has been manually placed in position with its tip in the gap G. When the push button 60 is depressed, it actuates a pneumatic timing relay 61 and at the same time energizes a control 62 for magnetic valve 44 to begin the application of air pressure and thereby the dispensing of the bonding material from the nozzle. After a predetermined short interval of time, the pneumatic timing relay 61 energizes the starter 63 of the motor 22 to start the motor and cause the table 16 and, in turn, the cathode ray bulb thereon to rotate. As the table rotates, the bonding material is dispensed from the nozzle 27 into the gap G. As the table nears one complete revolution, a limit switch 64 is actuated by a cam screw 65 on the plate 46 to deenergize the control 62 for magnetic valve 44 and thereby interrupt the application of pressure to the bonding material in the dispensing cylinder 28. Also just prior to completion of the rotation of the table, the screw cam 55 momentarily opens the valve 54 to actuate the cylinder 56 and swing the nozzle upwardly and outwardly away from the cathode ray tube. When the full revolution of the table 16 is completed, another limit switch 66 is actuated by a screw cam 67 on the cam plate 46 to de-energize the motor. The apparatus is then in condition for another cycle.

It can thus be seen that in accordance with the apparatus a layer or bead of bonding material such as resin is applied in the gap G, the nozzle following the gap throughout the periphery without the need for any cams or fixtures. Any misalignment in positioning of the cathode ray tube on the table is readily compensated for by movement of the nozzle in a direction to follow the gap. It can further be seen that the configuration of the cathode ray tube does not affect the apparatus, satisfactory results being obtained both with rectangular and circular cathode ray tubes. Furthermore, as the size of a cathode ray tube changes, the movement of the nozzle will be such as to accommodate the change in the size. In the case where the bonding material is to be applied to a cathode ray tube which is of substantially diiferent overall diameter, the support 36 can be readily adjusted radially to bring the resin dispensing nozzle into a relatively difierent position with respect to the cathode ray bulb and thereby maintain the general type of movement.

As can be seen in FIGS. 4 and 5, the movement of the resin dispensing nozzle is generally radially inwardly and outwardly with the main body of the resin dispensing cylinder extending beyond the periphery of the cathode ray bulb except in the areas of the corners in the case of a non-circular bulb. With this arrangement of the cylinder and nozzle, a uniform application of bonding material is achieved.

In large commercial production, instead of supplying individual charges of premixed resin to the cylinder 28, the cylinder may be omitted and the components of the resin may be metered under pressure directly to the nozzle 27 through supply lines from sources which are under pressure and are controlled by valves similar to valves 48.

We claim:

1. In an apparatus for applying bonding material such as resin to the area of juncture between an implosion band and the periphery of a glass cathode ray bulb, the combination comprising a table for supporting the bulb with the area of juncture of the bulb and the implosion band extending upwardly,

means for rotating the table,

a dispensing nozzle having a downwardly extending tip,

means for mounting the dispensing nozzle for relatively free swinging movement about substantially horizontal and vertical axes with the tip of the nOZZle extending downwardly therefrom into contact with the area of juncture of the implosion band and the bulb so that the tip of the nozzle follows the area of juncture as the table is rotated,

and means for controlling the delivery of resin through the nozzle.

2. The apparatus set forth in claim 1 including means for operating the table and the resin controlling means in a manner such that (a) initially resin is delivered through the nozzle (b) after a predetermined interval, the table is rotated, (c) the delivery of resin and rotation of the table is continued until the table has made substantially one revolution (d) the dispensing of resin from the nozzle is interrupted and (e) the rotation of the table is finally interrupted.

3. The combination set forth in claim 2 including means for lifting the nozzle away from its position at the area of juncture of the implosion band and the bulb,

said operating means causing said last mentioned means to be operated as the table completes the single revolution.

4. The combination set forth in claim 2 wherein said operating means cause said last-mentioned means to lift said nozzle just prior to interruption of rotation of the table.

5. The combination set forth in claim 1 wherein said means for controlling the delivery of resin comprises an air cylinder.

6. In an apparatus for applying bonding material such as resin to the area of juncture between an implosion band and the periphery of a glass cathode ray bulb, the combination comprising a table for supporting the bulb with the area of juncture of the implosion band and extending upwardly, means for rotating the table,

a fluid operated cylinder adapted to contain resin,

a dispensing nozzle on the end of said cylinder,

said dispensing nozzle having a downwardly extending means for mounting the cylinder for relatively free swinging movement about substantially horizontal and vertical axes with the tip of the nozzle extending downwardly therefrom into contact with the area of juncture of the implosion band and the bulb so that the tip of the nozzle follows the area of juncture as the table is rotated,

and means for applying fluid to said cylinder to control the dispensing of resin through the nozzle.

7. The combination set forth in claim 6 including means for operating the table and the resin controlling means in a manner such that (a) initially resin is delivered through the nozzle (b) after a predetermined interval, the table is rotated, (c) the delivery of resin and rotation of the table is continued until the table has made substantially one revolution (d) the dispensing of resin from the nozzle is interrupted and (e) the rotation of the table is finally interrupted.

8. The combination set forth in claim 6 wherein said table has an opening therein into which the neck of the bulb is adapted to extend for supporting the bulb with its face plate extending upwardly.

9. The combination set forth in claim 6 wherein said means for mounting said cylinder is adjustable in one of a plurality of horizontally radially spaced positions relative to said table.

References Cited UNITED STATES PATENTS 2,419,951 5/1947 Kastel 118410 X 2,550,335 4/1951 Dailey.

2,851,986 9/1958 Herschelman 118320 X 2,880,697 4/1959 Blanding et al. 1l88 X CHARLES A. WILLMUTH, Primary Examiner.

J. P. MCINTOSH, Assistant Examiner. 

